81186097 has 2 divisors, whose sum is σ = 81186098. Its totient is φ = 81186096.

The previous prime is 81186073. The next prime is 81186121. The reversal of 81186097 is 79068118.

It is a balanced prime because it is at equal distance from previous prime (81186073) and next prime (81186121).

It can be written as a sum of positive squares in only one way, i.e., 65788321 + 15397776 = 8111^2 + 3924^2 .

It is a cyclic number.

It is not a de Polignac number, because 81186097 - 2¹¹ = 81184049 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81186047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40593048 + 40593049.

It is an arithmetic number, because the mean of its divisors is an integer number (40593049).

Almost surely, 2^81186097 is an apocalyptic number.

It is an amenable number.

81186097 is a deficient number, since it is larger than the sum of its proper divisors (1).

81186097 is an equidigital number, since it uses as much as digits as its factorization.

81186097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 81186097 is about 9010.3327907464. The cubic root of 81186097 is about 433.0059736014.

The spelling of 81186097 in words is "eighty-one million, one hundred eighty-six thousand, ninety-seven".